/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.ant;

import org.apache.tools.ant.*;
import org.apache.tools.ant.types.*;
import proguard.*;

import java.io.*;
import java.util.Properties;

/**
 * This DataType represents a reference to an XML-style ProGuard configuration in Ant, or a file set of ProGuard-style
 * configuration files.
 *
 * @author Eric Lafortune
 */
public class ConfigurationElement extends FileSet {
    /**
     * Adds the contents of this configuration element to the given configuration.
     * 
     * @param configuration the configuration to be extended.
     */
    public void appendTo(Configuration configuration) {
        File baseDir;
        String[] fileNames;

        if (isReference()) {
            // Get the referenced path or file set.
            Object referencedObject = getCheckedRef(Object.class, Object.class.getName());

            if (referencedObject instanceof ConfigurationTask) {
                // The reference doesn't point to a file set, but to a
                // configuration task.
                ConfigurationTask configurationTask = (ConfigurationTask)referencedObject;

                // Append the contents of the referenced configuration to the
                // current configuration.
                configurationTask.appendTo(configuration);

                return;
            } else if (referencedObject instanceof AbstractFileSet) {
                AbstractFileSet fileSet = (AbstractFileSet)referencedObject;

                // Get the names of the existing input files in the referenced file set.
                DirectoryScanner scanner = fileSet.getDirectoryScanner(getProject());
                baseDir = scanner.getBasedir();
                fileNames = scanner.getIncludedFiles();
            } else {
                throw new BuildException(
                    "The refid attribute doesn't point to a <proguardconfiguration> element or a <fileset> element");
            }
        } else {
            // Get the names of the existing input files in the referenced file set.
            DirectoryScanner scanner = getDirectoryScanner(getProject());
            baseDir = scanner.getBasedir();
            fileNames = scanner.getIncludedFiles();
        }

        // Get the combined system properties and Ant properties, for
        // replacing ProGuard-style properties ('<...>').
        Properties properties = new Properties();
        properties.putAll(getProject().getProperties());

        try {
            // Append the contents of the configuration files to the current
            // configuration.
            for (int index = 0; index < fileNames.length; index++) {
                File configurationFile = new File(baseDir, fileNames[index]);

                ConfigurationParser parser = new ConfigurationParser(configurationFile, properties);
                try {
                    parser.parse(configuration);
                } catch (ParseException ex) {
                    throw new BuildException(ex.getMessage());
                } finally {
                    parser.close();
                }
            }
        } catch (IOException ex) {
            throw new BuildException(ex.getMessage());
        }
    }
}
